(define (curry2 f)
  (lambda(x)
    (lambda(y)
      (f x y))))

(define (curry3 f)
  (lambda(x)
    (lambda(y)
      (lambda(z)
       (f x y z)))))

(define (uncurry2 f)
  (lambda (x y)
    ((f x) y)))

(define (uncurry3 f)
  (lambda (x y z)
    (((f x) y) z)))